A modified θ projection model for constant load creep curves-Ⅱ.Application of creep life prediction

被引：2

作者：

Chao Fu ^{[1
]}

Yadong Chen ^{[1
]}

Xiaofei Yuan ^{[1
]}

Sammy Tin ^{[2
]}

Stoichko Antonov ^{[1
]}

Koichi Yagi ^{[3
]}

Qiang Feng ^{[1
]}

机构：

[1] Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing

[2] Department of Mechanical,Materials,& Aerospace Engineering,Illinois Institute of Technology

[3] National Center for Materials Service Safety,University of Science and Technology Beijing

来源：

Journal of Materials Science & Technology | 2019年 / 35卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Superalloy; Constant load creep; Modified θ projection model; Uniform deformation stage; Prediction performance;

D O I：

暂无

中图分类号：

TG115.57 [];

学科分类号：

080502 ;

摘要：

To minimize the deviation of the predicted creep curves obtained under constant load conditions by the original θ projection model, a new modified version that can be expressed by ε = θ;(1-e;) +θ3 (e;-1), was derived and experimentally validated in our last study. In the present study, the predictive capability of the modified θ projection model was investigated by comparing the simulated and experimentally determined creep curves of K465 and DZ125 superalloys over a range of temperatures and stresses. Furthermore, the linear relationship between creep temperature and initial stress was extended to the 5-parameter model. The results indicated that the modified model could be used as a creep life prediction method, as it described the creep curve shape and resulted in predictions that fall within a specified error interval. Meanwhile, this modified model provides a more accurate way of describing creep curves under constant load conditions. The limitations and future direction of the modified model were also discussed. In addition, this modified θ projection model shows great potential for the evaluation and assessment of the service safety of structural materials used in components governed by creep deformation.

引用

页码：687 / 694

页数：8